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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1b2b7bb163c905f70648b8ef1f52dfe50e794b83a35ff4b7163687f465dd04' 
  AND token = 'bGoOGZv9ZbkszYTEniYWRvpqeGsQQ6PbFucwYbs5Db4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}